JPH037740Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention Industrial Application Field The present invention relates to the structure of a heat exchanger, particularly a multi-tubular multi-stage cross-flow heat exchanger.

BACKGROUND OF THE INVENTION Generally, as heat exchangers become more efficient, increasing the number of stages in cross-flow heat exchangers using heat transfer tubes is an effective means.

For example, as shown in FIG. 1, a conventional multi-tube three-stage cross-flow heat exchanger is a single unit in which a large number of tubes 1, tube sheets 2, boxes 3, and expansion joints 4 are assembled in one casing 5. Three cross-stage heat exchangers are arranged in series,
It is constructed by joining adjacent flanges 5' of each stage and forming a fluid passage 7, and fluid A flows from the inlet of the cross-flow heat exchanger 10 in the final stage and crosses the outside of the pipe 1 at right angles. Heat is exchanged indirectly with the fluid B flowing through the pipe 1, and the fluid B flows through the fluid passage 7 into the pipe 1 of the intermediate stage cross-flow heat exchanger 9, and through the pipe 1 exchanges heat with the fluid B again. make an exchange,
It reaches the fluid passage 7 on the opposite side, and finally passes through the tube 1 of the first-stage cross-flow heat exchanger 8 for further heat exchange, and exits from the box 3 to the outside of the apparatus.

Problems to be solved by the invention However, the conventional three-stage cross-flow heat exchanger described above is just three single-stage cross-flow heat exchangers arranged in series, so there is no point in joining. The space required increases the volume and weight of the entire device,
Not only is it uneconomical as the floor area for installation and equipment manufacturing costs increase, but also there is a difference in thermal expansion between the casing 5 and the pipe 1 due to the difference in temperature between fluid A and fluid B. Two expansion joints 4 were required for each.

The present invention was devised to solve the problems of the conventional cross-flow heat exchanger described above, and its purpose is to reduce wasted space as much as possible and reduce the number of expansion joints in the device. To provide a heat exchanger that is simple and compact as a whole and can be manufactured at low cost.

B. Means for solving the structural problems of the invention The heat exchanger of the invention includes two sets of tube plates arranged at a predetermined distance apart in a casing, and a first fluid passing through the casing. Each set of tube sheets is composed of a tube sheet to which one stage of tube groups is attached, and a separate tube sheet to which two stages of tube groups are attached. A plurality of stages of tube groups are arranged in succession at predetermined intervals so as to cross the passage, both ends of each tube are attached to the tube plate of each set, and the tube group for one stage is attached. A bottomless box is integrally attached to the outside of the plate, and the box is connected and supported via an expansion joint to the inlet and outlet for the second fluid provided in the casing, respectively.
A bottomed box is integrally attached to the outside of the tube plate on which the tube group for each stage is attached to form a communication passage, and bolt insertion holes are opened in the mutually adjacent side walls of each box. A bolt is inserted into this and connected with a nut, and at least one of the two bolt insertion holes is set as an elongated hole in the longitudinal direction of the tube to enable relative movement between adjacent boxes, and furthermore, the elongated hole It is characterized by a leak-preventing cap attached to the inside of the cap.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 17 denotes a casing in which tube plates 12 and 21 and 12' and 21' are arranged at a predetermined distance apart. A straight passage B is formed.

Three stages of pipes 11 are arranged so as to cross the above-mentioned passage.
Groups (12 tubes in this embodiment) are arranged in succession at predetermined intervals, and both ends of each stage 11 are connected to the tube plates 12 and 21.
and 12' and 21', respectively.

The tube sheets 12 and 12' are one stage of tubes 11
(4 in this example) has a length to attach the group,
On the outside thereof are bottomless boxes 13 and 13', respectively.
are integrally installed.

Further, the tube sheets 21 and 21' have a length for attaching two groups of tubes 11 (eight in this embodiment), and are approximately twice the length of the tube sheets 12 and 12'. Bottomed boxes 18 and 18' are integrally attached to the outside of the tube plates 21 and 21', respectively, and form communication passages 23 and 24, respectively. Furthermore, the tube sheets 12 and 21 or 1
As is clear from FIG. 3, 2' and 21' are structured as separate bodies.

The boxes 13 and 13' are connected and supported to the inlet 22 and outlet 25 of the fluid A of the casing 17 via expansion joints 15 and 15', respectively.

Adjacent side walls 19 and 20 of the boxes 13, 13' and 18, 18', respectively, are shown in FIGS.
As shown enlarged in the figure, they are connected by bolts and nuts 14. The bolt hole in the side wall 19 is a long hole 19' in the longitudinal direction of the pipe 11 (see Figure 3).
The respective side walls 19 and 20 permit a relative movement of the tube 11, in particular in the longitudinal direction.

A leak prevention cap 16 prevents fluid from leaking from the gap in the bolt insertion hole.

Since the heat exchanger of this embodiment is configured as described above, the fluid A enters the box 13' from the inlet 22, flows into the group of tubes 11 at the final stage, and flows orthogonally on the outside. Exchanging heat indirectly with fluid B,
It flows out into the box 18 on the opposite side.

The fluid A that has flowed into the box 18 is transferred to the communication passage 2.
3 into the intermediate stage pipe 11 group, and the fluid B
The heat is exchanged again with the heat exchanger and flows out into the box 18' on the opposite side.

The fluid A that has flowed out into the box 18' enters the first stage tube 11 group through the communication passage 24, further exchanges heat with the fluid B, flows out into the box 13, and exits through the outlet 2.
5 and exits the device.

C. Effects of the invention (1) Since the tubes are successively arranged side by side at predetermined intervals on the tube plate, there is no extra space between each stage, and the entire device can be constructed compactly.

(2) The tube sheet is composed of separate one-stage tube sheets and two-stage tube sheets, and a separate box is attached to each tube sheet so that they can move relative to each other. Since the adjacent boxes are connected and held by bolts so as to be movable relative to each other, not only is distortion caused by a difference in thermal expansion eliminated, but also an expansion joint in the intermediate portion can be omitted.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a conventional multi-tubular three-stage cross-flow heat exchanger, Fig. 2 is a schematic cross-sectional view of an embodiment of the multi-stage cross-flow heat exchanger of the present invention, and Fig. 3 is a schematic cross-sectional view of an embodiment of the multi-stage cross-flow heat exchanger of the present invention. FIG. 4 is an enlarged view of the joint between adjacent boxes, and FIG. 4 is a cross-sectional plan view of FIG. 3. 11...Pipe, 12, 12', 21, 21'...Tube plate, 13, 13'...Box plate, 15, 15'...Expansion joint, 17...Casing, 16...Leak prevention cap, 18, 18'...Box, 19, 20
...Side wall, 22...Entrance, 23, 24...Communication passage, 25...Exit.

Claims (1)

[Scope of utility model registration request] Two sets of tube plates are disposed within the casing at a predetermined distance apart, and a first tube plate is inserted through the casing.
In addition to forming a linear passage for fluid, each set of tube sheets includes a tube sheet to which one stage of tube groups is attached, and a separate tube sheet to which two stages of tube groups are attached. A plurality of stages of tube groups are arranged in succession at predetermined intervals so as to cross the passage, both ends of each tube are attached to the tube plate of each set, and the tube group for one stage is attached. A bottomless box is integrally attached to the outside of the tube sheet, and the box is connected and supported via expansion joints to the inlet and outlet for the second fluid provided in the casing. A bottomed box is integrally attached to the outside of the tube plate to which the tube group is attached to form a communication passage, and bolt insertion holes are opened in the mutually adjacent side walls of each box, In addition to inserting a bolt into this and connecting it with a nut, at least one of the two bolt insertion holes is made an elongated hole in the longitudinal direction of the tube to enable relative movement between adjacent cases, and furthermore, the elongated hole is A heat exchanger characterized by a leak-prevention cap attached to the inside.